
Doug is a Chartered Alternative Investment Analyst who spent more than 20 years as a derivatives market maker and asset manager before “reincarnating” as a financial media professional a decade ago.
Before joining Britannica, Doug spent nearly six years managing content marketing projects for a dozen clients, including The Ticker Tape, TD Ameritrade’s market news and financial education site for retail investors. He has been a CAIA charter holder since 2006, and also held a Series 3 license during his years as a derivatives specialist.
Doug previously served as Regional Director for the Chicago region of PRMIA, the Professional Risk Managers’ International Association, and he also served as editor of Intelligent Risk, PRMIA’s quarterly member newsletter. He holds a BS from the University of Illinois at Urbana-Champaign and an MBA from Illinois Institute of Technology, Stuart School of Business.
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

In financial markets, a bull market is a period during which prices are rising consistently. The term refers most often to the stock market, although it can also apply to other securities and commodities. A âbullâ is an investor whoâs optimistic, confident, and expects that the good times will keep rolling.
Thereâs no official rule as to what defines a bull market, but in general, market analysts and pundits define it as a gain of 20% or more from a recent low in a major financial benchmark such as the S&P 500. Its counterpart, a bear market, is one in which prices have fallen 20% from a recent high. Learn more about bull and bear markets.
A bullish stock market usually occurs during the growth phase of the economic cycle.
These phenomena create a feedback loop: Good news fuels investor enthusiasm, which drives more buying and higher prices.
Bull markets can last for months or even years. The U.S. experienced its longest bull market from 2009 (after the financial crisis of 2007â08) to early 2020 (when the bull market was interrupted by the COVID-19 pandemic). It was driven by a post-recession recovery, low interest rates, and expanding tech companies.
Thereâs an old Wall Street adage that âbull markets donât die of old age; they die of fright.â Although thatâs not universally true, there are a few things that have historically spelled the end of a bull cycle:
Not coincidentally, these are among the fundamental causes of a bear market.
When the market is trending upward, investors often look for ways to make the most of the momentum. Here are a few common strategies in bull markets:
Although bull markets offer opportunities for portfolio growth, theyâre not risk free. Overconfidence can lead to overvalued stocks or even asset bubbles. Eventually, every bull market runs its course and ushers in a new bear cycleâsometimes slowly, sometimes sharply. For investors, understanding the signs of a bull market can help balance excitement with prudent risk management.
This article was most recently revised and updated by Doug Ashburn